Shoe-sewing machine.



No. 774,654. PATBNTED NOV. 8, 1904.

M. T. DENNE.

SHOE SEWING MACHINE.

APPLICATION FILED JULY 8, 1901.

N0 MODEL. 9 SHEETS-SHEET 1 Wzilmsse Jill/EILZOI.

No. 774.654. PATENTED NOV. 8, 1904.

M. T. DENNE.

SHOE SEWING MACHINE.

APPLIOATION FILED JULY 8. 1901.

N0 MODEL. 9 SHEETS-SHEET 2.

Wit/away.

PATENTED- NOV. 8, 1904.

M. T. DENNE.

SHOE SEWING MACHINE.

APPLICATION FILED JULY 8. 1901.

F0 MODEL.

-M. T. DENNE. SHOE SEWING MACHINE.

APPLICATION FILED JULY 8. 1901.

no MODEL.

,4 4 13 11 h g H y 9 Q :2

PATENTED NOV. 8, 1904.

9 SHEETS-SHEET 4.

No. 774,654. PATENTED NOV. 8, 1904. M. T. DENNE.

SHOE SEWING MACHINE.

APPLIOATION FILED JULY 8. 1901.

N0 MODEL.

9 SHEBTS-SHBET 5.

Fig.8.

No. 774,654. PATENTED NOV. 8. 1904.

' M. T. DENNE.

SHOE SEWING MACHINE.

APPLICATION FILED JULY 8- 1901.

N0 MODEL. 9 SHEETS-SHEET 6.

Inuenbvr PATENTED NOV. 8, 1904.

M. T. DENNE. I

SHOE SEWING MACHINE.

APPLIUATION FILED JULY 8. 1901.

9 SHEETS-SHEET 7.

no 110mm.

Witnesses.

PATENTBD NOV. 8, 1904.

- M. T. DENNE.

SHQE SEWING MACHINE.

APPLICATION FILED JULY 8. 1901.

N0 MODEL. 9 SHEETS-SHEET 3.

Fig.1?

No. 774,654. PATENTED NOV.8,1904. M. T. DENNE.

SHOE SEWING MACHINE.

APPLICATION FILED JULY 8. 1901.

N0 MODEL 9 SHEETS-SHEET e.

UNITED STATES I Patented November 8, 1904.

PATENT OFFICE.

MARK THOMAS DENNE, OF LONDON, ENGLAND, ASSIGNOR TO JOHN CAVE 8: SONS, LTD., OF RUSHDEN, ENGLAND.

SHOE-SEWING MACHINE.

SPECIFICATION forming part of Letters Patent N0. 774,654, dated November 8, 1904.

Application filed July 8, 1901. Serial No. 67,471. (No model.)

To all whmn it may concern.-

Be it known that 1, MARK THOMAS DENNE, a subject of the King of Great Britain, residing at 22 Finborough road, Fulham, London, England, have invented new and useful Improvements in Sewing-Machines, of which the following is a specification.

This invention relates to boot and shoe sewing machines of the type described in the specifications of Letters Patent Nos. 505,034. and 529,064, and has for its object to improve the construction and improve the efficiency of such machines.

In the accompanying drawings, Figures 1 and 2 are respectively a front elevation and a plan of a sewing-machine constructed according to my invention. Fig. 3 is a sectional side elevation looking toward the left-hand side of the machine. Fig. 4: is a similar view looking toward the right-hand side of the machine. Fig. 5 is a horizontal section on the line 5 5, Fig. 3. at right angles to one another of one of the parts of the machine carrying the bearings for the main or cam shaft. Figs. 8, 9, and are respectively afront elevation, a sideelevation, and a plan of the awl-feeding mechanism. Figs. 11 and 12 are respectively an elevation and a plan of the mechanism for controlling the pressr-foot or channel-guide; and Fig. 13 is a section on the line 13 13, Fig. 12. Figs. 14: and 15 are respectively a side elevation and a plan of the mechanism for engaging the needle-thread with the needle; and Figs. 16 to 19 are detail views, to a larger scale, illustrating the operation of this mechanism. Figs. 20 and 21 are respectively an elevation and a plan of the needle-thread measuring or controlling devices.

a is the framing of the machine, and 6 is the main or cam shaft supporting in bearings 6 6. The said shaft 6 is made readily removable, together with the bearings 6 6, by supporting or forming the latter on plates 6 6 preferably of approximately triangular shape, as shown clearly in Fig. 6, the said plates being formed with bosses 6 6 projecting inwardly to meet similar bosses 6 6* on the frame a of the machine below the Figs. 6 and 7 are elevations cam-shaft 6. The bosses 6 6 are advantageously provided with recesses 6" 6 engaging projections 6 6 on the bosses 6* 6 on the frame a, as clearly shown in section in Fig. 1 at the left-hand side of the said figure, this arrangement serving to secure the alinement of the bearings 6 6.

6 6 are screws passing through the bosses 6 6 into the bosses 6* 6* and serving to hold the plates 6 6 in position.

0 is the rotary shuttle, having the hook c for engaging the needle-thread and mounted in the shuttle-race 0 the said shuttle being arranged to be rotated in adirection opposite to that described in the said former specifications from the shaft6 through the medium of the helical gear-wheels 0*, shaft 0 and crank 0, having a projection c engaging a recess 0 in the shuttle.

(Z is the curved needle, supported in the carrier or segment 06, designed to partly rotate on a hollow base 660 of a bracket 06*, carried by the framing a, and having its barb on the opposite side to that described in the said former specifications. The needle (Z is operated from the shaft 6 through the medium of a cam-groove (6 Fig. 4, in a disk (Z roller (Z engaging the said groove-lever d, Fig. 3, carrying the said roller, gear-teeth d on the end of the said lever, and gear-teeth 667 on the carrier d engaging the teeth (6.

e is the needle-guide, mounted upon the boss of the carrier cl, as shown clearly in Fig. 5.

f, Figs. 4c, 8, and 10, is the awl for puncturing the Work for the passage of the needle d and also for effecting the feed of the work. The said aWl is supported by the carrier or segment f, provided with a pin or tailpiece f arranged to partially rotate and slide longitudinally within the hollow boss (Z of the bracket 06*, as shown clearly in Fig. 5. By arranging the pin f Within the boss (6 a good long fitting is obtained without increasing the total length of the needle and awl carriers or their bearings. The partial rotation of' the pin f and consequently of the awlf, is effected, as indicated in Fig. i, from the camshaft 6 through the medium of the cam-groove f roller j, lever f", carrying the said roller,

gear-teeth f on the said. lever, and gear-teeth f on the carrier f engaging the teeth f.

to move in ways or guides g upon the frame a. The block carries the projecting arm 9, embracing a boss of the awl-carrier f, so that the said awl-carrier can rotate within the arm g and be moved longitudinally by the same.

is a collar to hold the carrier f" in position in the arm g and prevent endwise movement in the same.

The feeding movement of the awl is varied by means of a curved block g- (to which the link g is attached,) designed to slide in a curved groove g in the lever a screw g passing through a curved slot in a flange on the block g", serving to clamp the block to the lever g By varying the position of the block 9 in the groove g so as to approach or recede from the fulcrum of the lever g it will be understood that the feeding movement of the awl will be also varied. In order that there shall be no side play between the roller g* and the cam-groove g, l advantageously form the groove with inclined sides, so that it is wider at the top than at the bottom, and 1 form the roller slightly tapering to correspond with and fit the groove and mount it upon a screw in the lever g so that should there be any side play due to wear the said screw can be adjusted to move the roller farther into the groove.

it is the table or support for the work, the said support having formed in it the slot /t, Fig. 5, for the passage of tie awl f from the under side and the needle (Z from the upper side.

if, Figs. 4, 11. and 12, is the presser-foot or channel-guide, arranged to turn on the hollow boss cl", Fig. 5, of the bracket cl) so that it can be adjusted relatively with the work-support 72 according to the thickness of the work, and its pressure relieved while the work is being fed by the awl.

72 is a lever-handle fulcrumed to the frame at Hand connected to the presser-footthrough the medium of the lever 75', link it, and arm if on the said presser-foot whereby the latter can be lifted in order to enable the work to be placed in position on the table it.

a is a spring one end of which is connected to the lever 7L while the other end is connected to the frame a, the said spring serving to cause the presser-foot if to bear with pressure upon the work and hold it firmly.

In order that the presser foot shall be locked or prevented from yielding while the needle is passing therethrough and the stitch being formed, I arrange that it shall be locked, and for this purpose I employ the following mechanism that is to say, 1 form an extension ion the lever If, the said extension being formed with a segment of pointed teeth having its center at the fulcrum 7L4. is a spring-pawl which by engaging the teeth 7; locks the presser-foot, the said pawl sliding in a recess i in a lever 21*, fulcrumed at f and 2 in the frame a of the machine and in a bracket r1 respectively.

For enabling the pressure of the presserfoot on the work to be relieved while the awl is feeding the work 1 provide the lever 71* with a roller '11, held in contact with the periphery of the disk g by the spring '21, the said disk having a cam groove or surface 2' in the path of the said roller, so that in the rotation of the said disk 9 when the said cam groove or surface '5 comes opposite the roller the latter will be caused to enter it by the spring i", thereby turning the lever r on its fulcrum and turning the lever 7&3 also upon its fulcrum through the medium of the pawl 21 and extension 2' and through the medium of the connections if it if slightly lifting the presserfoot 75 For unlocking the presser-foot when it is required to place the work on the table it I arrange that the pawl shall be withdrawn from the part of the lever 7L", and for this purpose I form a cam or raised surface upon the disk 9, and I fulcrum to the bracket 1' a lever j, carrying at one end a roller 7' designed to be held against the disk 9 in the path of the cam-surface j by means of a spring f connected at one end to an extension on the said lever, while the other end is connected to the bracket 2' The other end of the lever 7" is provided with a pin which extends through a hole Fig. 11, in the bracket i and bears against a crank-arm fulcrumed to the bracket 77, the upper end of the said arm f engaging a recess 1' in the pawl The part of the pin y'* which bears against the arm 7' is preferably formed eccentric to the main part, (which is screwed throughout the lever 7",) so that it can be adjusted relatively with the said arm by rotating it. By the described arrangement when the cam-surface comes into contact with the roller 1' the pin 7' is caused to press against the arm .7 and forces back the pawl 21 out of engagement with the teeth a" of the part 2' of the lever it, so that the latter can be moved to lift the presser-foot 71 The pawl i is advantageously formed of a series of bars laid side by side in the recess 2' each of the said bars having a recess 1' at its rear end for the reception of a spring 7' one end of which bears against the end of the recess 7', while the other end bears against a plate j", fixed to the lever i" by a screw 7' In the drawings the pawl is shown as consisting of four bars. as indicated in Fig. 12 by the dotted lines. By constructing the pawl in parts or IIO sections, as described, the points of each part can be more easily ground when removed from the recess 2' than if the pawl were formed of one piece.

is a cam projection similar to the projection j and which I advantageously employ for operating the lever j to move the pawl d to release the presser-foot just before the awl leaves the work after it has done feeding the same.

The needle (7 is arranged with its barb on the opposite side to that described in the before-mentioned specifications, as hereinbefore described,and consequently turned away from the last stitch made. In order that the needlethread can be engaged with the said barb, I provide the following mechanisn1that is to say, I arrange a looper 70, Figs. 1, 3, 4, and 14 to 19, having an eye at its upper end and mounted upon the upper end of a vertical rocking shaft carried in a bearing in a bracket 702 and designed to be rotated in the said bearing by means of a cam-groove k in a disk 7a through the medium of a roller 70 a lever 7J fulcrumed on a pin 7: supported in the frame a and one of the plates 6 and carrying the said roller on one end, a link 7: connected at one end to the other end of the lever 70 by a universal joint 70", and a crank 71 on the lower end of the shaft 70 and connected by another universal joint 72 to the other end of the said link 75*. By this arrangement of mechanism a reciprocating movement is given to the looper 70, so that it moves across the plane of movement of the needle immediately in the front of the barb when at its lowest point. As shown clearly in Fig. 16 and Fig. 17, which are elevations atright angles to one another, the needlethread Z passes from the last stitch made in the work on directly to the eye 70 in approximately a straight line at right angles to the surface of the work when the needle is in the position shown and is then led to the roll or pulley n, Figs. 1, 3, and 4, on the end of the usual take-up lever n.

0, Figs. 1, 3, 4, and 14 to 19, is a hook or thread puller adapted to engage with the thread Z between the looper-eye 7c and the work on and mounted upon a semicircular sliding block 0, arranged to slide in a correspondingly-shaped groove 0 in the bracket 70 This sliding is effected by a cam-groove 0 in the disk (Z through the medium of a roller 0 a lever 0, fulcrumed on the pin k and carrying the roller 0 at one end, a link 0 connected at one end to the other end of the lever 0 while the other end of the link is connected to the slide 7c. By means of the said groove 0 and the described connections the hook 0 is caused to describe a circular path rearwardly in a vertical plane in line with and above the said looper-eye when the latter is in the position shown in the drawings.

By the'described arrangement of looper 7c and hook 0 it will be seen that, assuming the parts to be in the position shown in Figs. 16 and 17 and the cam-shaft b rotated in the direction of the arrow, Fig. 3, the hook 0 will be caused tomove in a rearward direction to the position indicated by the dotted linesin Fig. 17, so as to form the loop shown and also indicated by dotted lines.

In consequence of the shuttle revolving in a direction opposite to that above described in the specification before referred to it is necessary in order that a twisted loop of thread may be avoided that the lower end of the loop of thread between the last stitch made and the looper-eye just described with reference to Fig. 11 should be transferred to the opposite side of the needlethat is, to the barbed sideand this is effected as follows: During the rearward movement of the hook 0 to form the loop shown by the dotted lines in Fig. 11 the needle is descending; but before it reaches its lowest point the looper-eye 70 crosses its path to the right, as indicated in Fig. 18, which is a somewhat similar view to Fig. 16, while the thread-hook 0 remains stationary. This movement of the looper-eye causes the portion of the thread between the said eye and hook to lie to the right of the path of the needle for presentation to the barb of the latter. The needle then moves down a little farther to its'lowcst point, as shown in Fig. 19, which is a similar view to Fig. 18, and the looper 7c is caused to return or move to the left, also as shown in Fig. 19, thereby drawing the thread into contact with the barbed portion of the needle (Z, which then rises through the work, drawing the thread with it, thus forming the loop for the engagement of the shuttle.

The take-up lever n is fulcrumed to the frame a at n and is operated from a camgroove n Fig. 3, in the disk 75* on the shaft 6 through the medium of a roller n", a lever. a carrying at one end the roller 71* and fulcrumed on the pin 7: and at its other end carrying a pivoted slide-block 72/, arranged to slide in a groove or recess a in the take-up lever 12.

9, Fig. 3, is the tension-wheel at the rear of the machine around which the needle-thread passes in its passage to the positive locking device and to the needle (Z. This locking device conveniently comprises a pin or stud Figs. 20 and 21, arranged to slide within a socket g at the rear of the bracket 7: and to grip the needle-thread against the bottom of the said socket. This gripping is effected by the periphery of the disk (Z through the medium of a roller 1 in contact with the said disk, a lever (f carrying the said roller at one end and fulcrumed to the frame a at q and a semicircular part (1 of the fulcrumg forming a crank to bear on the head of the pin 9. For relieving the pressure of the pin q upon the needle-thread at the required time recesses q q are formed in the disk d in the path of the roller (1 a spring g arranged beneath the head of the pin q, causing the stud q to move out of contact with the thread and cause the roller to enter the said recesses q 9 when the latter comes opposite the said roller. The thread after passing through the locking device passes around pulleys g (1 carried by the bracket k thence through a hole q in the said bracket and. around another pulley 9 also carried by the said bracket, and thence to the pulley n on the take-up lever 12/.

The needle-thread-controlling device for the positive measuring off of the amount of thread required for the needle is arranged as follows: The thread in its passage from the tension-wheel p to the locking-stud 9 would move in a straght path if no thread were required to be given off; but in raising the presser-foot when placing the work upon the table A of the machine two pulleys or rollers r 7*, Figs. 20 and 21, mounted upon a lever r, connected to the fulcrum of the lever-handle h, are brought into contact with the thread at a small distance apart and displace the thread from its straight path, the amount varying with the thickness of the work placed between the presser-foot and the table, as will be ob vious, the position of these pins being changed only as inequalities of the work come under the presser-foot. A third pin r is carried by a lever 1*, connected to the fulcrum of the take-up-lever n, which fulcrum is in alinement with the fulcrum of the lever-handle it and receives a constant motion in common with the latter, and while the thread is held by the before-mentioned locking-stud q during the formation of a stitch this pin descends upon the thread between the rollers r and forces it between them a varying distance, according as it meets the thread crossing the rollers at .an earlier or later point in its movement, and

draws a corresponding amount from the supply over the tension-wheel p. The amount of thread required for the next stitch to be made is thus held in reserve until the completion of the stitch being made, when the locking-stud q is lifted and the length measured drawn beneath it by the take-up lever a. s s are guards above the rollers r r to prevent the thread from becoming disengaged from the said rollers.

The operation of the machine is as follows: Assume the parts to be in the position shown in Figs. 1, 2, 3that is to say, with the needle partly descending and the awl partly withdrawn from the work. If the shaft 5 be rotated in the direction of the arrows, Figs. 3 and 4, the awl will move down from the work and the needle follow it, moving through the work and engaging with the loop of thread formed by the looper and thread-puller in the manner hereinbefore described. The needle then moves up through the work, drawing the thread in the form of a loop in its barb into position to be engaged by the hook c of the shuttle, the needle dipping, so that the hook c of the shuttle in its rotation releases the loop from the barb of the needle. The loop is then carried over the shuttle, thereby inclosing the thread from the spool of the shuttle in the usual. manner, the take-up lever a drawing the needle-thread down through the work over the shuttle-thread. While the above-described operations of the shuttle and needle are taking place, the awl f moves upward into the work and pierces and moves or feeds it to the left until the said awl is in line with the needle. The needle now commences to descend until it reaches the position shown in the drawings, thus completing the cycle of operations.

No claim is made herein to the mechanism for locking the presser-foot herein shown and described, as the said mechanism forms the subject-matter of Letters Patent No. 737,716, granted to me September 1, 1903.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is 1. In a sewing-machine of the kind described. the combination with a semirotary needle, and a shuttle rotating in a plane at right angles to the plane of rotation of the needle, of a semirotary awl, and a carrier therefor, a laterally-sliding block secured to said carrier, for feeding the work, an operating-lever pivoted to the machine, a tapering friction-roll carried by one end of said lever, a cam for operating said lever provided with a wedge-shaped cam-groove fitting said friction-roll, adjusting mechanism for adjusting said friction-roll with respect to said lever and cam, and operative connections between the said lever and the said. sliding block, substantially as described.

2. In a sewing-machine of the kind described, the combination with the semirotary needle, a semirotary awl and a shuttle rotating at right angles to the needle and awl, the said needle being provided with a barb on the side opposite the completed stitches of the work, of a looper having a movement from one side to the other of the needle, and provided with an eye for the passage of the needle-thread, a vertically-disposed rocking shaft located below the needle and carrying said looper, and operative mechanism connected to said shaft for oscillating the same and the looper, a hook having a back and forward reciproeation,for engaging the thread and forming the loop, mechanism for moving thelooper across the path of the needle before the descent of the latter through the Work, and for returning the looper to its original position to place the thread in engagement with the barb of the needle, substantially as described.

3. In a sewing-machine of the kind described, the combination with the semirotary needle, a semirotary aWl and a shuttle rotating at right angles to the needle and awl, the said needle being provided with a barb on the side opposite the completed stitches of the Work, of an oscillating looper capable of movement from one side of the needle to the other, a vertically-disposed rocking shaft located below the needle and carrying said looper, a crank on said shaft, cam-operated devices connected to said crank for imparting oscillating movement to the shaft and looper, a hook mounted on a slide, capable of movement back and forward, mechanism for operating said slide to cause the hook to engage the thread and form the loop, mechanism for moving said looper from one side of the needle-path to the other prior to the descent of the needle, and for returning said looper and laying the thread in the barb of the needle on said return movement, substantially as described.

4. In a sewing-machine of the kind hereinbefore described provided with a semirotary needle, a semirotary awl and a shuttle rotating in a plane at right angles to the needle and awl, the combination With the presserfoot of a lever in operative connection there- With, two rollers or pins on the said lever over Which the needle-thread passes from the tension-Wheel to the positive locking device, a third roller or pin, a lever carrying the same and having its fulcrum in alinement with the first-mentioned lever and in operative connection with the take-up lever the said roller being in such a position that it can pass between the two first-mentioned rollers and carry With it the needle-thread, substantially as, and for the purpose, set forth.

MARK THOMAS DENNE.

Witnesses:

JOHN W. McFALL, J. L. J. HALL. 

